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package java.security.cert;
import java.util.Iterator;
import java.util.Set;
/**
* An immutable valid policy tree node as defined by the PKIX certification
* path validation algorithm.
*
* One of the outputs of the PKIX certification path validation
* algorithm is a valid policy tree, which includes the policies that
* were determined to be valid, how this determination was reached,
* and any policy qualifiers encountered. This tree is of depth
* n, where n is the length of the certification
* path that has been validated.
*
*
Most applications will not need to examine the valid policy tree.
* They can achieve their policy processing goals by setting the
* policy-related parameters in {@code PKIXParameters}. However,
* the valid policy tree is available for more sophisticated applications,
* especially those that process policy qualifiers.
*
*
{@link PKIXCertPathValidatorResult#getPolicyTree()
* PKIXCertPathValidatorResult.getPolicyTree} returns the root node of the
* valid policy tree. The tree can be traversed using the
* {@link #getChildren getChildren} and {@link #getParent getParent} methods.
* Data about a particular node can be retrieved using other methods of
* {@code PolicyNode}.
*
*
Concurrent Access
*
All {@code PolicyNode} objects must be immutable and
* thread-safe. Multiple threads may concurrently invoke the methods defined
* in this class on a single {@code PolicyNode} object (or more than one)
* with no ill effects. This stipulation applies to all public fields and
* methods of this class and any added or overridden by subclasses.
*
* @since 1.4
* @author Sean Mullan
*/
public interface PolicyNode {
/**
* Returns the parent of this node, or {@code null} if this is the
* root node.
*
* @return the parent of this node, or {@code null} if this is the
* root node
*/
PolicyNode getParent();
/**
* Returns an iterator over the children of this node. Any attempts to
* modify the children of this node through the
* {@code Iterator}'s remove method must throw an
* {@code UnsupportedOperationException}.
*
* @return an iterator over the children of this node
*/
Iterator getChildren();
/**
* Returns the depth of this node in the valid policy tree.
*
* @return the depth of this node (0 for the root node, 1 for its
* children, and so on)
*/
int getDepth();
/**
* Returns the valid policy represented by this node.
*
* @return the {@code String} OID of the valid policy
* represented by this node. For the root node, this method always returns
* the special anyPolicy OID: "2.5.29.32.0".
*/
String getValidPolicy();
/**
* Returns the set of policy qualifiers associated with the
* valid policy represented by this node.
*
* @return an immutable {@code Set} of
* {@code PolicyQualifierInfo}s. For the root node, this
* is always an empty {@code Set}.
*/
Set getPolicyQualifiers();
/**
* Returns the set of expected policies that would satisfy this
* node's valid policy in the next certificate to be processed.
*
* @return an immutable {@code Set} of expected policy
* {@code String} OIDs. For the root node, this method
* always returns a {@code Set} with one element, the
* special anyPolicy OID: "2.5.29.32.0".
*/
Set getExpectedPolicies();
/**
* Returns the criticality indicator of the certificate policy extension
* in the most recently processed certificate.
*
* @return {@code true} if extension marked critical,
* {@code false} otherwise. For the root node, {@code false}
* is always returned.
*/
boolean isCritical();
}